Implantable signal generator



FIG. 1 is an isometric view of an implantable signal generator showingour new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a back elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The features shown in broken lines depict environmental subject matteronly and form no part of the claimed design.

CLAIM The ornamental design for the implantable signal generator, as shown and described. 